1990 Event KTBN, Salt Lake City Utah, begins shortwave radio transmissions 1990 Event KUSW, Salt Lake City Utah, final shortwave radio transmissions 1958 Event KUT-FM in Austin Texas begins radio transmissions 1957 Event WJZ-TV in Baltimore MD begins radio transmissions 1930 Event WIS-AM (now WOMG) in Columbia South Carolina begins radio transmissions 1929 Event WJW-AM in Cleveland Ohio begins radio transmissions 1929 Event KLO-AM in Ogden, Utah begins radio transmissions 1929 Event KIT-AM in Yakima WA begins radio transmissions 1929 Event WHP-AM in Harrisburg Pennsylvania begins radio transmissions 1929 Event KID-AM in Idaho Falls, Idaho begins radio transmissions 1929 Event KOY-AM in Phoenix Arizona begins radio transmissions 1929 Event KDB-AM in Santa Barbara, California begins radio transmissions 1928 Event WGH-AM in Newport News Virginia begins radio transmissions 1928 Event KXO-AM in El Centro California begins radio transmissions 1928 Event WGL-AM in Ft. Wayne IN begins radio transmissions 1928 Event WMT-AM in Cedar Rapids IA begins radio transmissions 1928 Event WOL-AM in Washington D.C. begins radio transmissions 1928 Event KOH-AM in Reno NV begins radio transmissions 1928 Event KPQ-AM in Wenatchee WA begins radio transmissions 1928 Event KGB-AM in San Diego, California begins radio transmissions 1927 Event KGA-AM in Spokane WA begins radio transmissions 1926 Event KEX-AM in Portland OR begins radio transmissions 1926 Event KYA-AM in San Francisco, California begins radio transmissions 1926 Event WOW-AM in Omaha NE begins radio transmissions 1926 Event KXL-AM in Portland OR begins radio transmissions 1926 Event KVI-AM in Seattle WA begins radio transmissions 1925 Event KUT-AM in Austin Texas begins radio transmissions 1925 Event WSM-AM in Nashville, Tennessee begins radio transmissions 1925 Event WJR-AM in Detroit Michigan begins radio transmissions 1925 Event KMA-AM in Shenandoah IA begins radio transmissions 1925 Event KSL-AM in Salt Lake City UT begins radio transmissions 1924 Event KOA-AM in Denver CO begins radio transmissions 1924 Event WHO-AM in Des Moines Iowa begins radio transmissions 1924 Event WLS-AM in Chicago, Illinois begins radio transmissions 1924 Event WGN-AM in Chicago, Illinois begins radio transmissions 1924 Event KGO-AM in San Francisco, California begins radio transmissions 1923 Event WRC-AM in Washington D.C. begins radio transmissions 1923 Event WMC-AM in Memphis Tennessee begins radio transmissions 1922 Event WHB-AM in Kansas City Missouri begins radio transmissions 1922 Event KNX-AM in Los Angeles, California begins radio transmissions 1922 Event KOB-AM in Albuquerque, New Mexico begins radio transmissions 1922 Event WDZ-AM in Decatur, Illinois begins radio transmissions 1922 Event KFI-AM in Los Angeles California begins radio transmissions 1922 Event KGY-AM in Olympia WA begins radio transmissions 1922 Event WWL-AM in New Orleans LA begins radio transmissions 1922 Event KMJ-AM in Fresno California begins radio transmissions 1922 Event WEW-AM in Saint Louis Missouri begins radio transmissions 1922 Event KGW-AM in Portland OR begins radio transmissions 1922 Event WIP-AM in Philadelphia Pennsylvania begins radio transmissions 1922 Event WBT-AM in Charlotte North Carolina begins radio transmissions 1922 Event WKY-AM in Oklahoma City OK begins radio transmissions 1922 Event KGU-AM in Honolulu Hawaii begins radio transmissions 1922 Event KSD-AM in Saint Louis Missouri begins radio transmissions 1922 Event WGR-AM in Buffalo New York begins radio transmissions 1922 Event WRR-AM in Dallas Texas begins radio transmissions 1922 Event KLZ-AM in Denver CO begins radio transmissions 1922 Event KJR-AM in Seattle Washington begins radio transmissions 1922 Event WWJ-AM in Detroit Michigan begins radio transmissions 1922 Event WLW-AM in Cincinnati OH begins radio transmissions 1922 Event KHQ-AM in Spokane WA begins radio transmissions 1922 Event WHK-AM in Cleveland OH begins radio transmissions 1922 Event WOR-AM in New York City begins radio transmissions 1922 Event WOC-AM in Davenport, Iowa begins radio transmissions 1922 Event Marconi begins regular broadcasting transmissions from Essex 1922 Event WGY-AM in Schenectady New York begins radio transmissions 1922 Event WHA-AM in Madison WI begins radio transmissions 1922 Event KQV-AM in Pittsburgh Pennsylvania begins radio transmissions 1921 Event KWG-AM in Stockton California begins radio transmissions 1921 Event KYW-AM in Philadelphia, Pennsylvania begins radio transmissions 1921 Event WBZ-AM in Boston MA begins radio transmissions
